diff --git a/src/meshlabplugins/filter_isoparametrization/filter_isoparametrization.pro b/src/meshlabplugins/filter_isoparametrization/filter_isoparametrization.pro
index 71147eac1..c61d6630d 100644
--- a/src/meshlabplugins/filter_isoparametrization/filter_isoparametrization.pro
+++ b/src/meshlabplugins/filter_isoparametrization/filter_isoparametrization.pro
@@ -35,9 +35,9 @@ macx:QMAKE_CXXFLAGS += -fopenmp -D_USE_OMP
 macx:QMAKE_LFLAGS += -fopenmp
 linux-g++:QMAKE_CXXFLAGS += -fopenmp -D_USE_OMP
 
-win32-msvc:LIBS	+= ${MESHLAB_DISTRIB_DIRECTORY}/lib/win32-msvc/levmar.lib
-win32-g++:LIBS += -L${MESHLAB_DISTRIB_DIRECTORY}/lib/win32-gcc -llevmar
-macx:LIBS += ${MESHLAB_DISTRIB_DIRECTORY}/lib/macx64/liblevmar.a
+win32-msvc:LIBS	+= $${MESHLAB_DISTRIB_DIRECTORY}/lib/win32-msvc/levmar.lib
+win32-g++:LIBS += -L$${MESHLAB_DISTRIB_DIRECTORY}/lib/win32-gcc -llevmar
+macx:LIBS += $${MESHLAB_DISTRIB_DIRECTORY}/lib/macx64/liblevmar.a
 linux-g++:LIBS += -llevmar
 
 # Please never ever uncomment this...